Screw-plate



'(No Model.)

- H. 1). BARN-ES.

SCREW PLATE. No. 369,158. Patented A ug. 30, 1887.

&

UNITED STATES PATENT Orrrcn.

HENRY D. BARNES, OF NEW HAVEN, CONNECTICUT.

SCREW-PLATE.

SPBCIFICATION forming part of Letters Patent No. 369,158, dated August30, 1887.

Application filed May 4, 1885. Serial No. 164,302.

To all whom it may concern.-

Be it known that I, HENRY D. BARNES, of New Haven, in the county of NewHaven and State of Connecticut, haveinvented a new Improvement inScrew-Plates; and I do hereby declare the following, when taken inconnection with accompanying drawings and the letters of referencemarked thereon, to bea full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1, an under side View of a screwplate, showing the guideattached; Fig. 2, a side view of the same; Fig. 3, the guide plate withthe disk removed, showing the radial guides; Fig. 4, an under side viewof the disk, showing the spiral ribs for operating the guides; Fig. 5, acentral section through the die-plate and guide-plate on line a; 00 ofFig. 1; Fig. 6, an inside view of the screw-cutting plate, the diskremoved; Fig. 7, an inside view of the disk, showing the spiral cams orribs; Fig. 8, a section on line y y of Fig. 1.

Thisinvention relates to an improvement in plates for hand-cuttingscrewsthat is to say,

plates which carry dies for cutting the thread,

the plate provided with handles by which the workman may turn the plateto cut the thread upon a rod or bolt.

In applyinga plate to a rod or bolt to cut a screw-thread thereon it isdifficult for the workman to hold the plate in a plane at exactly rightangles to the axis of thescrew to be cut, and if not so held, then thethread will be at an angle to the axis, and the bearing-face of the nutapplied to that thread must stand at a corresponding angle to thethread.

The object of my invention-is the construction of an adjustable guideadapted to be removably attached to a screw-plate, so as to serve as aguide to locate the screw-cutting dies in proper relation to the body ofthe bolt on which the thread is to be cut; and it consistsin theconstruction, as more fully hereinafter described, and particularlyrecited in the claims.

In illustrating my invention I show it as applied to a screw plate of myown invention, and for which Letters Patent of the United States weregranted to me September 9, 1879,

(No model.)

ranged therein several screwcutting dies, a. (Here represented asthree.) These dies are arranged radially and so as to be moved radiallyfrom or toward the center, and they are so moved by a disk, B, whichcovers one side of the plate and has upon its inner face camlike ribs1), which work into corresponding grooves, d, in the back of the dies,and so that by turning the plate 13 the dies are moved out and in,according to the direction in which the disk B is turned. From the platehandles 0 D extend, respectively, to the right and left, and by whichthe plate may be rotated in cutting the screw.

Upon the under side of the plate A is a circular plate, E. This plate isconstructed with radially-projecting ears 6 diametrically opposite eachother, and adapted to be secured to the principal plate by screws f orotherwise. As here represented, the ears are constructed with a slot, 9,opening from opposite sides, and so that when the screw-heads are raisedslightly the ears may be passed beneath the heads, the slots passingunder the body of the respective screws, and then upon the screws beingset they will hold the plate E to the principal plate A.

In the plate E several radial guides, F, are arranged, (here representedas three,) and are so arranged as to be moved radially within the platetoward or from the center in similar manner to the dies in thescrew-cutting plate.

Upon the plate E adisk, G, is applied, having upon its inner surfacespiral ribs h, more or less in number, and the corresponding surface ofthe guides F is constructed with grooves 2', corresponding to the saidspiral ribs, and so that the ribs of the plate will set into the grooveson the guides, as seen in Fig. 5.

The disk G is arranged to be rotated upon the plate E, and is held inits position by a ring, H, at the center, having a flange, Z, ex tendingonto the surface of the disk G, as seen in Fig. 5,the ring H firmlysecured to the plate E by rivets, as shown, or otherwise, but yet so asto leave the disk G free for rotation.

The opening through the ring should be submoved inward or outward,according to the direction of the rotation of the disk.

In use the workman sets the plate over the end of the bolt to be outuntil the guides F are below its end. Then he turns the disk G to bringthe guides F to an easy bearing upon the surface of the bolt, as seen inFig. 3, broken lines indicating the bolt. The depth of the guides givessufficient bearing to bring the plateinto a plane at right angles to theaxis of the bolt. Then the workman proceeds in the usual manner forusing the plate-that is, having set his dies to the proper position, herotates the plate about the bolt to cause the cutting-edge of the diesto cut the thread upon the surface of the bolt, because of the guides Fproperly locating the plate with relation to the bolt the thread will becut so that the face of the nut must stand at exactly right angles tothe axis of the bolt. In other words, the thread will be cut with thesame accuracy with relation to the axis of the bolt as if it were cut ina screw-cutting machine.

I have illustrated my invention as applied to a die-plate of peculiarconstruction; but it will be understood that the guide-plate may beapplied to die-plates of various constructions with equal advantage. Theguide-plate may therefore be made as an article of manufactureindependent of the screw-plate.

I claim- 1. The combination of the plate E, constructed withradially-projecting ears 6 diametrically opposite each other, the saidears each constructed with an open slot, g, guides F, arranged in saidplate free for radial move ment, the disk G, arranged upon said platefree for rotation, constructed upon its under surface with spiral ribs71 adapted to work in corresponding grooves in said guides F, andwhereby said guides, under the rotation of said plate, are movedradially, and the ring 11', sub stantially as and for the purposedescribed.

2. The combination, with a die-plate, of a removable adjustable guidingattachment consisting of a frame adapted to be removably attached to thedie-plate, guiding-jaws mounted in the said frame, and devices carriedby the same for operating them, substantially as set forth.

3. The combination, with a die-platc, of a removable adjustable guidingattachment consisting of a frame adapted to be removably attached to thedie-plate, guiding-jaws mounted in the said frame, and a rotaryscroll-plate carried by the same for operating them, substantially asset forth.

4.. The combination, with a dieplate, of a removable adjustable guidingattachment consisting of an annular frame adapted to be re movablysecured to the die'plate and provided with a flange and recess, asshown, grooved guiding-jaws radially mounted in the said frame, and aplate provided with a scroll entering the recess in the frame andengaging with the jaws mounted therein, and having notches or a groovereceiving screws located in the flange of the frame and securing theplate thereto, substantially as set forth.

5. The combination, with a die-plate having the lower face of its casecountersunk, of an adjustable guiding attachment consisting of aframe'carrying jaws and means for operating them, and devices fordetachably securing the said attachment to the die-plate, into thecountersink of which the attachment enters, substantially as set forth.

HENRY D. BARNES.

\Vitnesscs:

J OHN E. EARLE, J osnrn O. EARLE.

